Accurate CNC Eccentric Pin, Polygon Grinders

Sponsored Content – IMTS 2016 Technology eNewsletter

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Shigiya (USA) Ltd.’s efficient and high-accuracy GPES-30 series of CNC eccentric pin/polygon grinders feature a highly rigid base and thermal expansion control.

The GPES-30’s revolutionary process of grinding two different eccentric areas within the same chucking eliminates or drastically reduces setup time. Journal grinding and face grinding options are available. An innovative polygon grinding method also eliminates or reduces training and adjusting. Plunge, oscillation and traverse grinding are also available.

For smooth and stable movement, the GPES-30 features closed hydrostatic slideways for the wheelhead feed, which automatically adjust to maintain the position of the wheelhead. As a result, eccentric grinding can be performed to an accuracy of less than 1 micron.

A high-speed, non-circular wedge-type hydrodynamic spindle bearing further contributes to high accuracy and high efficiency grinding. The direct drive spindle features a high precision angular contact bearing with no backlash on movement. Located behind the workhead, the rotary diamond dresser’s spindle is supported by an ultra-precise angular contact bearing and lubricated with Micro-Fog. An AE sensor and wheel flatness sensor are also included as standard. The GPES-30’s tailstock is mounted with a large diameter spindle to further ensure high precision heavy grinding.

The GPES-30 is controlled with Shigiya’s easy-to-use conversational programming system.  With this system, eccentric pin grinding offset direction can be quickly measured with the OD gage, and operators can choose from 13 polygon pre-programmed shapes. Other features of the system include shape compensation, automatic workhead speed override, automatic grinding conditions, a new wheel dressing cycle and an indicator for X-axis speed and acceleration.

The GPES-30 features a 300-mm-diameter swing over table, and 250 mm or 630 mm of distance between centers. Wheel size is 350 (OD) × 25 (W) × 127 (ID) mm.

Visit the company's IMTS showroom for more information.

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